The MicroCast

How many miles a week do you need to run to get better? It's the question coaches hear most, and the annoying answer is: enough to create an adaptation, not so much that you can't absorb it. The body doesn't experience a mileage total. A mile on a 14er and a mile on a track are completely different stresses, which is why time at effort is a better way to think about volume than distance. TJ and Zoë break volume into four levers. How much: the difference between the minimum effective dose, the optimal dose, and the maximum recoverable dose, and why most runners should be asking about the middle one. How often: what 3, 4, 5, 6, and 7 days a week actually get you, and why frequency is the most overlooked tool for newer runners. How long: why 15 + 5 is not a 20-mile long run, and why the cost of a run doesn't rise in a straight line. And where: easy/hard distribution, the weekend-warrior trap, and why back-to-back long runs are a tool rather than an organizing principle. It all starts from the same place — the week you can actually repeat, found in your TrainingPeaks history, not the week you're proudest of. First, TJ has an answer for what happened at Leadville. Then: a listener question about Nordic skiing all winter and protecting running fitness for a spring 50K, and Hot or Not on mocktails, aid station hydration mixes, and Tiger Balm. Questions for a future episode: microcosmcoaching@gmail.com Coaching and community: https://microcosm-coaching.com

Leadville 100 week gave Microcosm both ends of the sport in a single day: coach TJ David's athlete McKendree Hickory won the women's race in her 100-mile debut, and TJ himself dropped at the Winfield turnaround after nearly fifty miles of not being able to breathe. Zoë and TJ take both apart honestly. On the win: what five months of coaching actually changed, why TJ inferred McKendree was naturally durable from four years of training history, and how identifying two points of friction — pacing discipline and a reluctance to lean into discomfort late in races — mattered more than overhauling everything. She raced her dress rehearsals under fatigue, ran a conservative early pace by design, and degraded only 8.25 percent over a hundred miles at altitude, where ten to fifteen is considered excellent. On the DNF: the difference between confidence and self-efficacy, why protecting mental bandwidth during race week is a training variable, and what it's like when a heart rate that should read 114 reads 140 at mile ten. TJ walks through the internal argument, the broken poles on Hope Pass, the decision at Winfield, and how he's processing a race he trained two years for. Plus a listener question up front: can you build a Boston qualifier on a treadmill, and what has to happen outside anyway. Questions for a future episode: microcosmcoaching@gmail.com Coaching and community: https://microcosm-coaching.com

Your easy pace is slower than it was two months ago. Workouts feel harder. You're doing more volume than you've ever done — so shouldn't you be getting faster? A listener wrote in with exactly that question, and it turned into a full episode. Coach TJ and Zoë unpack why feeling slower in a big block is usually the block working, not the block failing — and how to tell the difference when it isn't. The core idea: fitness and performance are not the same thing. Fitness is the physiological capacity you've built. Performance is how much of it you can access on a given day. Every training stimulus produces both a fitness response (slow, cumulative, quiet) and a fatigue response (fast, temporary, extremely loud). Fatigue is louder than fitness — you don't wake up feeling your mitochondrial density, but you absolutely feel Tuesday's workout on top of Sunday's long run. IN THIS EPISODE - Why aerobic base and durability are the two slowest adaptations in endurance sport — and why that means you can't train for just one race - The real sources of training fatigue: glycogen depletion, peripheral muscle fatigue, neuromuscular fatigue, connective tissue loading, and central/autonomic nervous system stress - Why comparing today's run to the same route two years ago on Strava is apples to oranges - Goodhart's Law in training: the moment easy pace becomes the metric you optimize, it stops being a useful proxy for fitness - Progress signals that actually mean something: same pace at lower RPE, same RPE over more vert, better output late in long runs, tolerating back-to-back long runs, and — the most underrated one — recovering faster from the same load - Can training make you less fit? The honest answer, plus why "worse at a 5K while training for a 100" isn't the same as losing fitness - Normal acute fatigue vs. functional overreaching vs. non-functional overreaching vs. actual overtraining syndrome — and why most athletes who think they're overtrained are under-recovered - The red-flag list: elevated easy RPE for days-to-weeks, repeated failure at previously manageable workouts, recovery that doesn't produce a rebound, sleep disruption, mood and motivation changes, recurrent illness, injury creep, menstrual cycle disruption - What TJ's biggest-ever build actually looked like: 15-hour weeks, multiple 100-mile weeks, four (sometimes five) long runs a week, and running slower than he ever has ALSO IN THIS EPISODE — HOT OR NOT - The Leadville 100: no qualifiers to enter, aggressive early cutoffs, and where the competitive incentives are drifting - Changing shoes mid-race (a caveated yes) - Sitting down at aid stations (a hard no, and the physiology behind it) - Listening to podcasts while racing (one yes, one very firm no) BETTER QUESTIONS THAN "AM I GETTING FASTER?" Am I tolerating more training? Am I recovering from it? Am I generally healthy and adequately fueled? Does performance return when fatigue comes down? Don't confuse a temporary inability to express fitness with the absence of it. - Zoë's UltraSignup article on Goodhart's Law: https://trailhead.ultrasignup.com/science-outdoors/data-for-runners/ GET IN TOUCH Questions for a future episode: microcosmcoaching@gmail.com Coaching and community: https://microcosm-coaching.com

Email us your listener questions or hot or nots at microcosmcoaching@gmail.com. Check us out online at microcosm-coaching.com Downhill running is a technical skill, not a fitness problem, and this week Zoë Rom and TJ David break down the science of eccentric loading, the repeat bout effect, and how to descend faster without trashing your quads. They go inside the muscle to explain what actually happens to your sarcomeres on a long descent, why delayed onset muscle soreness peaks a day or two later instead of immediately, and why force output can stay down for up to a week even after the soreness clears. From there it's the practical stuff: how braking multiplies eccentric load, why sitting back is the single most common descending error, how to train your eyes on technical terrain, why fear itself makes descending harder, and where strength work genuinely helps versus where it can't replace actual practice. Plus Hot or Not on blood donation for endurance athletes, the red blood cell and iron math every runner should understand before donating, and how to time it around a race build, and random race pacers. In the listener question, a runner training for their second 50 miler on seven hours a week asks whether elite ultra training is fundamentally different from everyone else's. Short answer: same recipe, different dose. The episode opens with training through summer heat, racing amid wildfire uncertainty, and why holding your goal race lightly is a useful gut check.

Recovery is the ceiling on your training — not your mileage, not your workout schedule. Zoë Rom and TJ David break down the five places recovery falls apart for endurance athletes: not sleeping enough, chronic underfueling, easy days that drift into the gray zone, treating life stress like it doesn't count as training stress, and never taking a real down week. They walk through the physiology of why fitness is actually built between sessions — mitochondrial development, angiogenesis, muscle repair, glycogen refill — and why every one of those processes needs three non-negotiables: raw materials, a calm nervous system, and time. Plus an honest take on recovery gimmicks, including compression boots, massage guns, and cold plunges that may blunt the very adaptations you trained for. Also in this episode: Zoë's report from Soft Rock, the four-day Hardrock loop, and why non-race adventures belong on your calendar; a Hot or Not round on Nike's Aeroflow cooling apparel, homeopathic remedies for Achilles tendinopathy, and wicket drills for trail runners; and a listener question from Foothills member Michael on how to debrief a first 100-miler — starting with feel, then heart rate decoupling and first-half/second-half slowdown. Pick the one you're worst at. Set one committed action for the next five days. Coaching inquiries: microcosmcoaching@gmail.com Join Foothills ($10/month): microcosmcoaching.com — code FOOTHILLS10

ou've built the fitness. Now what? This week we're digging into training specificity: how to shape your training around the actual demands of your goal race, whether that's a road marathon, a 50K, or a 100-miler like Leadville or Hardrock. Specificity is the sexy stuff athletes love to obsess over, but it's also where we see the most expensive mistakes. We break down what race-specific training actually means, when it belongs in your training calendar, and the traps that cost athletes their races. What we cover: Specificity is earned. Why general fitness is the raw material and specificity is just the sculpting, and why "couch to 50K" plans set athletes up to fail The training funnel. Wide and general in base season, narrow and race-specific 8 to 12 weeks out, with fine-tuning inside the final two to three weeks Duration and time on feet. Why training for the hours you'll be out there matters more than the miles on the race page (100 miles can mean 14 hours or 30) Vert, terrain, and eccentric loading. Why per-mile elevation ratio beats a weekly vert number, how to read a course profile (three 1,000-foot climbs is not one 3,000-foot climb), and training downhill resilience with the repeat bout effect Fueling and gut training. The most underrated specificity of all: why you need to practice your race-day fueling for a minimum of 12 weeks The number one trap: sacrificing fitness on the altar of specificity, from course-obsessed weekend commutes to heat suits on the treadmill in January Plus: Listener question: "I missed my long run, so I added the miles to next week and dug myself into a hole." Why makeup miles don't exist, why the body knows stress rather than miles, and how to actually rearrange a training week when life blows up your schedule Hot or Not: running belts, handhelds, gas station candy as ultra fuel, and strength training during the taper We're off for a two-week summer break and back in August. Questions for a future episode? Email us at microcosmcoaching@gmail.com or find us at microcosm-coaching.com.

What is fitness, really? VO2 max, lactate threshold, running economy, durability, and neuromuscular power — in this episode we break down the five distinct systems hiding inside that one word, how each one develops, which respond fastest to training, and which age best. If you've ever chased a watch number and wondered why your race results didn't follow, this framework explains why "getting fitter" is actually five separate questions — and how periodizing your training over years brings them together on race day. We also answer a timely listener question about running in wildfire smoke: what PM2.5 actually does to your lungs, how to use AQI (and its limits), CDC guardrails for exercising outside, when to move to the treadmill, and how to set your line in the sand before race day — including what to do if smoke rolls in mid-race. Plus Hot or Not: gravel running, Garmin's heat acclimation metric, photochromic lenses, and whether bells or eye patches actually deter mountain lions (spoiler: your voice works better). Send us your Hot or Nots and listener questions: microcosmcoaching@gmail.com Curious about coaching? Join the Foothills tier — $10/month for twice-monthly Ask-A-Coach calls and our Slack community of 200+ athletes. Use code FOOTHILLS10 at microcosm-coaching.com

Heat training and altitude training are two of the most obsessed-over (and most misunderstood) tools in endurance running. In this episode, Zoë and TJ break down the actual science: what heat adaptation does to your blood plasma, why "poor man's altitude" is a myth, and how the EPO-to-hemoglobin response really works up high. They cover who should bother with heat or altitude training at all, the two questions to ask before you start, and why fundamentals like consistency, sleep, and fueling beat every environmental hack. You'll hear practical guidance on hot bath protocols, ferritin levels, live-high-train-low, and the 21-days-or-24-hours rule for racing at altitude. Plus: coach spotlight with James Nance, a listener question on time-based training in the mountains (the body doesn't know miles, it knows stress), and hot-or-not takes on golden hour and probiotics. Curious about coaching? Our Foothills tier is $10/month for twice-monthly Ask-A-Coach calls and a 200+ athlete Slack community. Use code FOOTHILLS25. Join at microcosm-coaching.com or reach out at microcosmcoaching@gmail.com . Coaching & Foothills tier: microcosm-coaching.com Email: microcosmcoaching@gmail.com Foothills promo: FOOTHILLS25 ($10/month)

Durability is the word every endurance runner has latched onto — but what actually is it, and how do you build it? Zoë and TJ break down durability for marathon and ultra runners: the difference between aerobic durability (heart rate drift and cardiac decoupling over long efforts) and mechanical durability (the eccentric loading that blows up your quads on late-race descents), why a smaller engine that doesn't fade beats a bigger one that falls apart, and why the only real path is years of consistent, recoverable volume. There's no shortcut — you have to put in the time to get to the place where you can put in more time. Before the main discussion, they take on three listener "hot or not" questions: whether antihistamines like Claritin really blunt training adaptations (the dose in that study matters more than you think), why swapping a strength session for yard work doesn't count, and the truth about chasing an "ultra bod" — energy availability, why underfueling undermines the adaptations you're working for, and why body composition is an output of training, not a lever to yank on. Plus downhill technique, easy volume, and TJ's three biggest coaching pet peeves. Curious about coaching but not sure where to start? Join our Foothills tier for $10/month — twice-monthly Ask-A-Coach calls and a Slack community of 200+ athletes. Use code FOOTHILLS25 at microcosm-coaching.com. — microcosm-coaching.com | microcosmcoaching@gmail.com

Sign up for our open house here! https://docs.google.com/forms/d/e/1FAIpQLSc0KnmFGBxZNYqTAZDNFSRUL86UXK7gCIVDDlLtWJBp5WoVvQ/viewform?usp=header AI vs. human coaching is the big question this week: can a chatbot really build your training plan, or is it a premium cookie cutter? Zoë and TJ break down what coaching actually is — the plan plus the relationship, communication, and buy-in that no model replicates — and dig into the research, including why studies lag behind the tools athletes are actually using, the 2025 analysis pointing toward hybrid human-plus-AI models, and why AI is a good summarizer but a poor authority. Before that, three rapid-fire segments: why you should hide the heart rate field while racing (and trust RPE instead of a signal that lags 30–90 seconds and gets polluted by heat, caffeine, and sleep debt), whether Hotshot actually fixes muscle cramps and side stitches or just floods your mouth with a sensory distraction, and how high humidity wrecks evaporative cooling, spikes your RPE, and slows your pace — plus why heat training isn't the biohack shortcut Instagram sells. Practical, evidence-based, and skeptical in the best way. Questions or hot takes? microcosmcoaching@gmail.com . Join the community on the Foothills tier ($10/month, code FOOTHILLS10).

🏃 Microcosm Open House — Wednesday, June 11th at 5:30pm MT (virtual). Meet the coaches, ask anything, no pressure. Sign up: https://docs.google.com/forms/d/e/1FAIpQLSc0KnmFGBxZNYqTAZDNFSRUL86UXK7gCIVDDlLtWJBp5WoVvQ/viewform?usp=header 💪 Want coaching without the full 1:1 commitment? Join Foothills for twice-monthly Ask the Coaches sessions — $10/month with code Foothills10 at microcosmcoaching.com Long runs, ultramarathon training, and fueling are at the heart of this all-time favorite episode, back by popular demand. Kristin Layne and Kyle break down how to actually build long run duration without breaking down — and why the biggest barrier to going long usually isn't fitness. They cover the physiology and psychology of pushing into unfamiliar durations, why you should think in time rather than miles, and how to grow your long run gradually (a good rule of thumb: keeping it under about 30% of weekly volume). You'll learn why you don't need to run your full race distance in training, how back-to-back long runs build confidence and durability, and where RPE should sit so you're building fitness instead of digging a fatigue hole. From dialing in 60–90g of carbs per hour and training your gut, to strength work for late-race durability, to mental tools like segmenting and telling the difference between uncomfortable and dangerous — this is a complete blueprint for stepping up to your first 50K, 50-miler, or 100. Give yourself the runway, and you can absolutely do it.

Sign up for our free open house here! (https://docs.google.com/forms/d/e/1FAIpQLSc0KnmFGBxZNYqTAZDNFSRUL86UXK7gCIVDDlLtWJBp5WoVvQ/viewform?usp=header) How do you know if your training, supplements, or recovery hacks are actually working — or if you're just fooling yourself? Zoë and TJ break down the science of the N of 1 experiment and how to self-coach intelligently in a world flooded with biohacks, miracle protocols, and "this one weird trick" content. Borrowing Feynman's first principle — you must not fool yourself, and you are the easiest person to fool — they walk through six cognitive biases that trick endurance athletes into believing something works when it doesn't: regression to the mean, the placebo of the shiny new toy, confirmation bias, the novelty honeymoon, comparison traps, and sunk cost. Then they get practical: how to actually test an intervention, change one variable at a time, define success before you start, and ask the question that cuts through the noise — compared to what? Plus a coach spotlight on James Nance, TJ's road back to Leadville, and Zoë's day-by-day approach to managing an Achilles flare-up. If you've ever overhauled everything after one bad race or wondered whether your $80 ketones are doing anything at all, this one's for you. Reach out anytime: microcosmcoaching@gmail.com .

Check out the fuel tracking app here! FuelFlow Running metrics, wearables, and training data get a reality check this week as Zoë and Kylee Van Horn cut through the noise of HRV scores, readiness ratings, and AI coaches to name the five numbers that actually move the needle in 2026. The episode opens with a familiar character: the athlete double-fisting a Whoop and a Garmin who hasn't strung four consistent weeks of training together in six months. From there, the conversation breaks down what makes a metric genuinely useful, is it actionable, is the signal strong enough to act on, can you verify the underlying measurement, and does it tell you something your body isn't already saying? Then comes the countdown of the five that earn a spot on your watch: rate of perceived exertion (the master metric), consecutive weeks of consistent training, your 14-day sleep average, your long run as a percentage of your 30-day max, and carbohydrate intake per hour on long runs. Along the way: why one bad night of sleep won't break you, the 2025 research linking a single oversized long run to a 128% jump in injury risk, and why most runners fuel with far fewer carbs than they think they do. Evidence-based, occasionally unhinged, and a genuinely useful nudge to audit what you're actually tracking. Questions or hot takes? microcosmcoaching@gmail.com

Running economy is one of the most misunderstood concepts in endurance training — and one of the most trainable. In this episode, Zoë Rom and TJ David break down what running economy actually is, why it matters more than VO2 max for marathoners and ultra runners, and the specific levers you can pull to get more output for the same input. Using the analogy of miles per gallon, they explain how two runners with identical VO2 max can run race times that differ by 20+ minutes — and what's going on under the hood to explain the gap. The conversation covers the seven physiological factors that determine economy, from tendon stiffness and motor unit recruitment to substrate utilization and thermoregulation. Then they dig into the five interventions that actually move the needle: strength training, plyometrics, strides, hills, and consistent aerobic volume over time. Finally, they bust four of the most persistent running form myths — that you need to run 180 steps per minute, that mid-foot striking is automatically better, that super shoes are cheating, and that form drills will fix your mechanics. If you're an intermediate runner who feels like you've plateaued despite logging the miles, this is the episode that explains what's missing. Plus a coach spotlight intro with Microcosm's Zachary Russell.

Hydration is one of the most overlooked levers in endurance performance — and one of the most punishing when you get it wrong. In this episode, Zoë and TJ unpack why dehydration is so much more than feeling thirsty, walking through the cascading downstream effects on your gut, your blood, your muscles, and ultimately your race result. They cover gut osmolality and why a too-concentrated drink mix actually pulls water the wrong way, the link between plasma volume drop and cardiac drift, and why dead legs late in an ultra often trace back to a sodium problem rather than a fitness one. The conversation then turns to the practical side: how to DIY your sweat rate test at home, why your sweat sodium concentration is the number that changes everything, and which lab tests Zoë and dietician Kylee Van Horn actually recommend after testing six different options. They also break down why generic 300–800 mg per hour sodium guidance fails most athletes, with real roster examples ranging from 200 mg to over 2,300 mg per hour. Before the hydration deep-dive, Zoë and TJ tackle a thoughtful listener question about the asides they sometimes make regarding endurance training and sexual health. They walk through the RED-S framework, what suppressed libido and menstrual dysfunction actually signal in athletes of all genders, and why these conversations belong in the coaching toolkit rather than as punchlines. Coach Kylee Van Horn at Fly Nutrition is mentioned as a go-to sports dietician for clinical questions. If you've ever had a mystery DNF, persistent GI distress, or fallen apart late in a race for reasons you couldn't pin down, this is the episode to listen to twice. Questions, topics, hot or nots: microcosmcoaching@gmail.com Learn more: microcosm-coaching.com

This week we welcome you behind the scenes of Microcosm Coaching with a quick introduction to Coach Zachary Russell, an athletic trainer and strength coach whose multisport background spans Ironman, triathlon, marathoning, and trail running. He shares what kinds of athletes light him up to coach and how his experience across disciplines shapes the way he builds plans. Then Zoë and TJ dig into TJ's recent Canyons Endurance Run 100K, which he completed roughly 80 minutes off his goal time after a brutal stretch of life context, including his dad's ongoing health and the loss of his uncle the night before the race. They talk about how Cliff and TJ restructured the build entirely, doing more base earlier and less intensity later, and yet Training Peaks read his fitness as identical to previous cycles. They get honest about caretaker stress, mental bandwidth, the choice to keep the door open to joy even when training feels heavy, and why the comparison trap between seasons can quietly steal everything. The bulk of the episode tackles a listener question from Delaney, who has noticed the same faces at every ultra and is wondering whether stringing races together actually counts as training. Zoë and TJ define training the way Microcosm uses it, intentional movement with an adaptive purpose, and reframe it as a continuum rather than a binary. They unpack the B race concept, the difference between racing it and running it, the lily pad effect of bouncing race to race without ever integrating what you learned, and the diminishing returns of using events as a substitute for consistency. They also offer a few honest questions to ask yourself, including whether you would still be putting in this volume if nothing were on the calendar, and what it means to build a higher floor in the interstitial periods most runners ignore. Have a question for the show? Email us at microcosmcoaching@gmail.com and check out microcosmcoaching.com to learn more about working with our coaches.

Why does your running fitness plateau, and what can you actually do about it? Zoë and TJ break down the five real reasons endurance athletes get stuck, a lack of training intentionality, under-recovery, chronic under-fueling, a mismatch between training and event demands, and failing to apply progressive overload across more than one lever. This episode also features a coach spotlight with James Nance, a Microcosm coach specializing in multi-sport athletes and RED-S recovery, TJ's mindset heading into race week at Canyons 100K, and a Reddit question on why your legs fall apart after your first 50K. New to Microcosm? Roster spots are open — email microcosmcoaching@gmail.com or visit microcosmcoaching.com.

Most runners follow a training plan. Very few understand the architecture behind why it's built the way it's built, and that gap is exactly where progress stalls. This week, we break down the science of periodization: what it actually is, how to structure a full training year around it, and the most common mistakes that keep athletes stuck in the gray zone. We cover training intensity distribution (pyramidal vs. polarized vs. mixed), block versus concurrent periodization and what the research actually supports, the five phases of a well-built training year, and why your easy days are probably not easy enough. Zoë also shares what she's noticed firsthand after switching to a block-style approach in her own training, the good, the bad, and the PRs. Before the main topic, we run through a Hot or Not triple-header: Nomeo broccoli sprout shots (real mechanism, no peer-reviewed human data yet), the Apex Narwhal palm cooling device (the Stanford science is interesting, the application for runners is not), and pelvic floor PT, which gets a full endorsement for every runner, regardless of gender or whether you've ever been pregnant. New to Microcosm? We'd love to be your coaches. Reach us at microcosmcoaching@gmail.com or visit microcosm-coaching.com.

Most runners ask one question before a race: did I finish my training plan? But fitness and race readiness are not the same thing — and in this episode, Zoë and TJ break down the physiological and psychological framework that actually tells you whether you're ready to toe the line. They start with the foundational model: fitness + freshness + specificity. Using the Banister fitness-fatigue model, they explain how both signals decay at different rates (fatigue's half-life is roughly 7–10 days; fitness is 40–45) — and why that gap is exactly where your race-day performance capacity lives. From there, they go sign by sign through five indicators you're ready — including aerobic decoupling and cardiac drift as readiness metrics, what glycogen supercompensation actually feels like during taper, why race-specific physiological systems (VO2max, lactate threshold, SGLT-1/GLUT-5 gut adaptation) can't be faked on race day, and how pre-race anxiety and pre-race arousal are the same physiological state with a different cognitive label. Then the five signs you're not: climbing out of a fatigue hole your neuroendocrine system is still broadcasting, missing race-specific work that willpower can't replace, running on a pain you've been rationalizing, under-fueling and under-sleeping your way to the start line, and the hardest conversation in coaching — when your goal and your fitness aren't in the same zip code. They also get into: Hot or Not on energy drinks at aid stations, AI-generated Spotify playlists vs. human curation, multi-day races and FKTs, and Prancercise (yes, really). Topics covered: The Banister fitness-fatigue model and why fitness and freshness decay at different rates Aerobic decoupling (Pa:Hr) and cardiac drift as race readiness signals Training Stress Balance (TSB): what the +10 to +25 range actually means Glycogen supercompensation during taper — and why you should not get on a scale VO2max, lactate threshold, and time-on-feet: the specificity gap Gut training: SGLT-1 and GLUT-5 transporter adaptation, and why 12 weeks out is not too early Pre-race arousal vs. anxiety — the Alison Wood Brooks reappraisal research HPA axis dysregulation, HRV, and the neuroendocrine signals of a fatigue hole DOMS vs. injury-relevant pain — the checklist coaches actually use WIG, WAG, and WOG: cascading race goals and why rigid goals aren't ambitious More at microcosm-coaching.com. Join the Foothills community for $10/month — group coaching, Slack community, and twice-monthly roundtables with Microcosm coaches.

Zoë and TJ are back from Italy and kicking off April with a packed episode. First up: coach Kyle Jones: a masters athlete and ultra running specialist with a focus on helping athletes who are all in on the long game, whether that's accumulating volume safely or solving the full puzzle of race-day logistics that go far beyond training. Then it's Hot or Nots. On the docket: incline stretch boards for calf and Achilles work (the evidence is real, but eccentric loading beats passive stretching for most underlying issues), packaged Rice Krispie Treats as race fuel (the macros check out — 27 to 30 grams of carbs, glucose plus fructose, low fiber — but the chewability at mile 50 is another story), Ziploc bags in ice bandanas (hard pass: the evaporation is the whole point), hybrid athletes as a category (the jury is out, but the coaches aren't your girls if high rocks is your thing), run clubs (yes, with a firm caveat on effort), and microdosing during ultras (the research case for decriminalization is strong; the research case for running 100 miles on psilocybin is still pending). The listener Q this week tackles one of the most common rules in running: you don't need to fuel for efforts under 90 minutes. Zoë and TJ break down why that's only half the story. There are actually two separate mechanisms at play — the metabolic pathway most runners know, and a neurological pathway most don't. Receptors in the mouth and upper GI tract signal the brain the moment carbohydrates are detected, easing the protective fatigue response before a single calorie has been absorbed. This has been demonstrated even when athletes swish a carb solution and spit it out. For high-intensity efforts like a hard half marathon, the case for fueling is stronger than the 90-minute rule suggests — and the practical takeaways are in the episode. The back half is a full race debrief on Chianti. Zoë ran an hour faster than last year and still came in 13th. TJ walks through how to approach a post-race analysis when the headline result doesn't tell the full story — and how Zoë's coach surfaced a key data point she almost missed entirely: cardiac drift. In 2025, Zoë's cardiac drift was 9.54% over the course of the race. In 2026, it was negative 1.39%, meaning she was actually able to access higher heart rates at the end of the race — a direct signal of aerobic durability built by keeping easy days genuinely easy, week after week. The conversation covers what cardiac drift actually measures, why gray zone training works against this adaptation, and what the terrain-specific limiter was that explains the placement gap.